Breaking in rebuilt engine?

Question:
I have a rebuilt 4 cylinder in a 94 beretta, is there anything that i should do as far as changing the oil after a couple hundred mile, or not going over a certain speed for awhile, driving only a certain distance ect...

Answers:

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there are 2 schools of thought on this
some say drive them very easy for a thousand miles or so..
as a racer i can tell you 99% of the motors i build ,get no break in at all...most are reved to the red line day one.
and they run just fine...

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Racers don't worry too much, because they're going to tear it back down soon anyway.

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Change the oil after about 500 miles, then at 1500 miles, then at regular 3000 mile intervals. Avoid hard acceleration and long periods at a single speed until after your second oil change. Be certain to change the oil filter each time--it's catching all the little bits...and a plugged filter is like having no filter at all.

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Check the oil and water DAILY until you know for certain you're not losing either.then go to weekly checks, which everyone should do anyway, but almost no one does.

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Has randell has pointed out there are two schools of thought on this issue. drive it easy or drive it like you stole it. regardless of how you decide the important aspect is to maintain your proper oil changes and fluid checks. start with a 500 mile change, then up to 1500 mile then on to the regular intervals of 3000 mile. I myself being a drag racer and performance engine builder i can tell you that i runum like i stole them. most of the engines i due dont get tore down after races. just keep the oil changed. regardless of how you decide to drive it, if its going to have a problem it will rear its ugly head be it a slow and easy break in or a fast and hard break in. If in doubt ask your machinist or engine assembler how they would suggest it be done.

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Watchout Randy there is a little excited.

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I would not hop in a fresh engine and race or take a 300 mile interstate trip.

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Lots of speed variation and throttle variation over about 500 miles then change the oil.

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Next 250 miles still take it easy and no max rpm drives

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At 750 start getting wild and then change the oil again at 1000 Miles.

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After that you will have a solid motor with everything meshed together properly.

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I usually start racing after the 750 mile mark if I have to.
My racecar has to get me to work everyday too!

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ASE Cert Auto tech 30 years

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Drive the car for about 250 miles.do not drive the car at steady speeds in this time period...speed up and let off.

96 ply. grd. voyager. Its getting gas & spark but when i try to start it, it only backfires & will not start?


Thi is to settle the rings in the bores and give them the refined barrel shape they need to allow the piston to rock in its bore without losing compression.

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Nowadays the moly rings break in quicker than yesterday's engines.change the oil and filter like I said and open the filter up.unravel the element and take a look..you should see shavings trapped in there.

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Once oil has been changed, drive like normal but don't race it until after 500 miles.
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